Try to fix OSX travis build
Try to fix OSX travis build

miamiruby/byebug,ozydingo/byebug,ozydingo/byebug,yui-knk/byebug,webdev1001/byebug,k0kubun/byebug,guilherme/byebug,k0kubun/byebug,scalp42/byebug,os97673/byebug,guilherme/byebug,saisai/byebug,icebreaker/byebug,icebreaker/byebug,miamiruby/byebug,deivid-rodriguez/byebug,webdev1001/byebug,scalp42/byebug,k0kubun/byebug,deivid-rodriguez/byebug,yui-knk/byebug,os97673/byebug,guilherme/byebug,yui-knk/byebug,saisai/byebug,deivid-rodriguez/byebug